the first cam i used in my Indy Maxx block was a comp cams solid, 280/284 @ 050 650 lift, ran well but we only got 9.7 @ 137mph best at the end of the season. that was ok as we were running 9.90 so it suited me. then i came into some $$$ so i bought ICH's R1 cam, 272/276 @ 050 660 lift got us into the 9.5's but struggled with hardwear coming loose all the time, eventually we scored one of the lobes so i sent it to a cam man for analylist. he said that cam had harmonics & should be reground. so we did it. came back 272/279@ 050 650 lift. wow big improvement, nothing comes loose & with a little work on the bodys areodynamics we ran a string of 9.4's last season. the flat tappet was waay hotter at 050 but the lesser roller has us running heaps faster. on a race motor, i will only buy a roller from now on. the extra HP is so much cheaper buying a roller cam.